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2015 Rolex 24 at Daytona pre-race notes

Reigning Indy 500 champion Ryan Hunter-Reay summarized our feelings on every year's Rolex 24 Hours at Daytona when he said, "The 24 kind of kicks off the year and has become part of my calendar... It definitely helps you get in race shape after a long layoff." Speaking of IndyCar drivers, 14 of the 33 pilots who started last year's Indy 500 are driving in Daytona this year, and an IndyCar driver has been part of the overall winning team for the last four years. The race starts at 2:10 pm Eastern Standard Time, here's where you can watch it: 2-4 pm: Fox Sports Network 4-8 pm: Fox Sports 2 8-10 pm: Fox Sports 1 10 pm-7 am: IMSA TV on IMSA.com - commentary available here for the full 24 hours 7 am – 2:30 pm (Sunday) – Fox Sports 1 Timing and Scoring Andy Blackmore's typically awesome Spotter's Guide Video primer on the four classes: Prototype (16 in this year's race), Prototype Challenge (8), GT Le Mans (10), GTD (19), and how to identify them. Daytona International Speedway: tri-oval with an infield road course, 3.56 miles long, 12 turns Entry list Qualifying results We've tagged along with Audi for the 53rd running of the race, which marks the first event in the Tudor United SportsCar Car Championship. After a difficult first year of teething – IMSA president and COO Scott Atherton said, "Everybody on our staff and everybody that raced with us last year would tell you it was the most challenging season on record" – some things are smoother this year, some things aren't, starting with the field: 53 cars are expected to line up, 14 fewer than last year, the smallest field since 48 cars lined up in 2011. The Prototype class shed three teams from 2014 and the GT Daytona class lost ten, so there's a 19-car field in that class (nine Porsche 911 GT Americas, three Ferrari 458 Italias, two each of the Aston-Martin V12 Vantage, Dodge Viper SRT, Audi R8 LMS, and one BMW Z4). Truth be told, last year's number was probably inflated by having the previous American Le Mans Series and Grand-Am Rolex Sports Car Championship combined to make the USCC; the field in 2013 was 57 cars, in 2012 it was 59 cars. Another factor in this year's race is that the GT class adopts FIA GT3 rules from next year. Brad Kettler, manager of Audi's customer motorsport program, said they'd sold five R8 LMS cars last year but zero for this year – there are undoubtedly teams waiting on the sidelines for the rules unification before spending the money.

Audi unveils A3 Sportback G-Tron with bi-fuel power, 808-mile range

By this time next year, the Audi A3 Sportback will be offered with a variety fuel-efficient powertrains ranging from diesel to the all-electric E-Tron, but perhaps the most interesting is the all-new G-Tron model, which uses Audi's innovative carbon-natural compressed natural gas called e-gas. Previously called A3 TCNG, we first heard about this technology last year, but now Audi has confirmed that this low-emission, sustainable-fuel will debut by the end of this year on the A3 Sportback G-Tron.
To create this e-gas, a plant in Werlte, Germany uses electricity to split water into hydrogen and oxygen. As hydrogen fuel cell vehicles become more popular, Audi says that this process could also be used to produce hydrogen fuel, but to create CNG, it mixes the hydrogen with carbon dioxide to create "synthetic methane." Since it is identical to the CNG available today, Audi's e-gas can be shipped and stored using the existing CNG infrastructure. Making the whole process even greener, Audi obtains the CO2 for this process from a nearby biogas plant, which would otherwise be released into the atmosphere.
Differentiated from the regular versions of the A3, the G-Tron features a pair of tanks under the rear cargo floor holding 15.43 pounds of CNG, which can power the car for almost 250 miles. What's more, the A3's conventional gasoline tank is still in place, giving the car an addition 560 miles of range. In total, that means the A3 G-Tron has a driving range of more than 800 miles. To run on both CNG and gas, Audi made changes to the car's 1.4-liter four-cylinder engine (including the turbo, cylinder head and fuel injection system) and catalytic converter.

Audi SQ7 coming, will have electric turbo

Formula 1 and endurance racing are already harvesting energy from turbos on the track, and now it's apparently time for a similar idea of boosting the efficiency of forced induction to hit the streets in a high-performance, diesel SUV.
In a recent interview with the UK's Autocar, Audi technical boss Dr. Ulrich Hackenberg let the big news slip. "The new Q7 will be available in the market next year but the electric turbo will come a bit later in the Audi SQ7 available in 2016," he said. The e-turbo system was already rumored for the premium SUV but for the standard model, not this just-announced performance version.
Audi has been experimenting with the e-turbo system for a little while, as an electrically driven supercharger. It showed up on the RS5 TDI concept that used a 3.0-liter, twin-turbocharged diesel V6 plus the electric system to diminish turbo lag. In that application, it provided an impressive 385 horsepower and 553 pound-feet of torque and an alleged sprint to 62 miles per hour in 4 seconds. Although, Dr. Hackenberg didn't make it clear if this was the exact layout for the SQ7.